Our large inventory of OEM Allison Transmission Parts includes a large line of new and rebuilt Allison automatic transmissions, and Allison Automatic transmission cores. All transmission parts can be shipped the same day in most cases. Call our Sales and Service Departments at 407-295-1221 or Email.

Troubleshooting Charts For Allison Transmissions AT / MT (B) / HT / V

The troubleshooting information contained in the following charts outlines the possible causes of transmission conditions and their remedies. Several possible causes are indicated; numbered items indicate suggested remedies for the causes. For Sales and Service Call America's #1 Supplier of OEM Allison Transmission Parts and Authorized Allison Dealer; TransDiesel Transmission Call us: 1-407-295-1221

I - TRANSMISSION THROWS FLUID OUT OF FILL TUBE AND/OR BREATHER Condition Probable Causes Suggested Remedies Transmission Throws Fluid Out of Fill Tube and/or Breather 1. Dipstick loose. 1. Tighten cap. Replace if necessary. 2. Transmission fluid level too high. 2. Drain to proper fluid level. (Be sure dipstick calibration is correct for specific model. 3. Transmission fluid level too low. 3. Fill to proper fluid level. (Be sure dipstick calibration is correct for specific model.) 4. Vacuum modulator failed. 4. Replace vacuum modulator. 6. Retarder linkage not properly adjusted. 6. Reset retarder linkage to proper adjustments. 7. Breather clogged. 7. Clean or replace breather. 8. Water in transmission fluid. 8. Drain and replace transmission fluid. 9. Dipstick gasket worn. 9. Replace gasket or dipstick. 10. Improper dipstick marking (improper fluid level). 10. Replace dipstick.